Disc brake, more particularly for motor vehicles



March 29, 1960 H, KLAUE 2,930,452,

DISC BRAKE, MORE PARTICULARLY FOR uo roa VEHICLES Filed Sept. 9. 1958 .l'nvemon' Harm arm K] a M: M X

- Fatented Mar.t 29,

2,930 52 In this way the operating balls are held fast radially at DISC BRAKE MORE PARTECUHARLY FGR brake part were distorted by thermal influences.

MOTOR VEHICLES The brake operating ring is then supported solely on.

Hermann Klaue, Uberiiugen, Bodensee, Gennany he centering balls, which roll on the second brake disc H which comprises merely a smooth raceway The centres Application September 1953! term! 759334 of the raceways for all the supporting balls, whichv con Claims lm-mity, application German, March 14, 1953 stitute the. pressure application points, expediently are. situated on generatrices of a cone whose axis is identical,

4 Qiaimswith the brake axis. 7

Each of the'two brake discs is provided at its inner periphery with an axial tooth system which engages in it Disc brakes are known wherein brake discs which are tooth system provided on the outer periphery of. the-cup mounted so as to be axially freely movable and are imshaped brake carrier. In order that the brake housing: movable in the peripheral direction are arranged in a and the brake unit arrangement therein canbe removed. rotatable ribbed housing and have brake linings disposed without demounting the brake unit: from the brake. on the sides facing the inner surfaces of the housing. It carrier, the latter is to be provided with an appropriate has also already been proposed to provide between the 1y dimensioned recess at the place where the operating.

a central ring which is pivotable in the peripheral direc- One example of embodiment is illustrated in Figures 1 tion and is coaxial to the said discs. The said ring, likev to 4. 1 the mutually facing inner sides of the brake disc, is pro- Figure 1 is a longitudinal sectional view through the vided with recesses which form raceways and areinclined axis of the disc brake. For the sake of greater clarity, in the peripheral direction and in which are mounted those parts of the brake which are not connected withballs which, when the brake operating ring is rotated, the invention have been omitted. cause the brake discs to bear against the rotating brake Figure 2. is a fragmentary side elevational view taken housing. along the line C-D of Figure 1.

The invention relates to brake discs of the type speci- Figure 3 is a partial sectional view through the brake; tied, equipped with an operating ring arranged between unit along the line A-B of Figure l.

the discs; The object of the invention is so to construct Figure 4 is an even smaller detail view, in section and these discs that they are simpler to manufacture and to on an enlarged scale, of the brake unit viewed in the assemble. It is also intended to reduce the space resamedirection as Figure 1. In this arrangement only quirements. V one brake disc comprises inclined camming surfaces of The solution of this problem according to the invensector-shaped cross-section, and the side of the operattion includes that only the inner surfaces of one brake ing ring facing the said disc does not have these. The disc and that side of the brake operating ring facing said inclined camming surfaces for the operating balls on the disc are provided with inclined recesses for camming enoperating ring are plane over the entire inclined portion. gagement of the operating balls, whereas the other side In the drawings, 1 designates the brake housing which of the brake operating ring, which ring is mounted more is connected by bolts 3 to the brake cover 2. Mounted ly by means of balls on the brake discs and the inner in this part of the brake which rotates with the vehicle, surface of the other brake disc each merely comprise a on the fixed brake carrier 4 is the brake unit which is smooth raceway for receiving the supporting or centeraxially displaceable on the latter and which conslsts of ing balls which are held spaced from one another by a two brake discs 5 and 6 and a brake operating ring 12. ball cage. The said supporting balls can be given a The brake disc 5 is provided with recesses 7 which are smaller diameter than the aforesaid operating balls in distributed uniformly over its periphery and Whichare order to save space. Instead of these, it is also possible inclined in the peripheral direction, and in Which the opto use rollers. The brake operating ring is provided at erating balls 10 are mounted. The other brake disc 6 one part of its inner periphery with a tooth system in comprises an annular projection 8 which is directed which engages a pinion fixed on an operating shaft towards the brake operating ring 12 and which is used mounted in the brake carrier. for carrying the raceway 9 for the supporting balls 15.

Owing to the unilateral arrangement of the inclined The ball raceways 7 of the brake disc 5 are situated opis improved since in cases where inclined ball raceways whichare inclined in the peripheral direction and are are arranged at both sides even a slight error in machinconstructed as plane surfaces in contrast to the raceways ing causes non-uniform application of a brake disc and 7. The raceways 7 and 11 form a series of inclined chantherefore a poor degree of eificiency in brake operation. nels, and an operating ball 10 is disposed in each channel The arrangement of a row of supporting balls used for in rolling contact with the raceways 7'and 11 thereof. supporting purposes and whose balls are smaller in diam- The brake operating ring 12 comprises a ball raceway eter than the brake operating balls, aifords the further 13 which is associated with the ball raceway 9 of the advantage that the entire brake assembly requires less brake disc 6. It bears on the brake disc 6 by means of space. the supporting balls 15 which are held by the cage 14. A further simplification in the production of the brake For rotating the brake operating ring 12, the inner peassembly more particularly with respect to the construcriphery thereof is provided with a toothed segment 16 inclined in the peripheral direction, or else the corre- 7O brake is operated, are made to contact the rotating hous' inner toothing 22 of the brake disc ring and the inner toothing 23 of the brake disc ring 6 engage in this toothing 21.

In order that the brake housing 1, 2 and the brake unit 5, 6, 12 arranged therein can be removed from the brake carrier without demounting the brake unit, the brake carrier 4 comprises, at the place where the operating pinion 17 for the brake operating ring 12 is situated, a recess 24 which in practice represents only an interruption of the tooth system 21 of the brake carrier 4.

In Figure 4, the chain-dotted straight line 25 indicates that the brake operating ring 12 is so supported on the brake disc 6 that the centres of the raceways of the supporting balls lie on the generatrices of a cone whose axis is identical with the brake axis.

I claim:

1. In a disc brake having a stationary brake carrier and a rotatable brake housing surrounding two non-rotating brake discs displaceable on said carrier axially of the housing axis for frictional brake engagement of the housing interior and an operating disc disposed in said housing between said brake discs and turnable about the axis of said housing independently of the housing rotation to move said brake discs apart, the combination of, the inner surface of one of said brake discs defining with one surface of said operating disc adjacent said one brake disc a series of channels each inclined relative to the periphery of said discs, one of said surfaces having a series of inclined raceway recesses each forming a part of a channel, the other of said surfaces having a series of inclined plane raceway faces each forming another part of a channel, a rotating wedge element disposed in each channel and being operable to roll on said inclined raceways for camming engagement thereof, a first annular raceway formed on the inner surface of the other brake disc, a second annular raceway formed on the opposite surface of said operating disc adjacent said second brake disc, a plurality of rolling elements disposed between said first and second annular raceways and in rolling contact therewith whereby, upon turning of said operating disc, said wedge elements will drive apart said one brake disc from said operating disc and other braking disc for braking action, and means connected to said brake carrier and operable for turning said operating disc.

2. In a disc brake, as claimed in claim 1, said recesses being formed on said one brake disc, and said faces being formed on said one surface of said operating ring.

3. In a disc brake, as claimed in claim 1, said first and second annular raceways having their center portions facing each other along the surface of a cone having an axis coinciding with the axis of rotation of said housing.

4. In a disc brake, a brake mechanism for use on the interior of a rotatable brake housing, and connected to a stationary brake carrier, said brake mechanism comprising two oppositely disposed brake discs each operable to be displaced to make frictional braking contact with an internal surface of the housing, means for displacing said brake discs axially of the axis of rotation of said housing comprising an operating disc disposed in said housing between said brake discs, the inner surface of one of said brake discs and the adjacent one surface of said operating disc defining a series of channels each inclined relative to the periphery of said discs and including a recess formed in one of said surfaces and a plane face formed on the other surface, a rolling wedge element disposed in each channel, thrust bearing means formed between said operating disc and the other brake disc, and means operable for rotating externally of said housing said operating ring.

References Cited in the file of this patent UNITED STATES PATENTS Frankland Sept. 6, 1932 Whitten Ian. 5, 1943 Ash Sept. 7, 1943 FOREIGN PATENTS Germany Mar. 17, 1952 Great Britain Aug. 2, 1921 

